The Imaging Methods for Classifying Crispiness of Freeze-Dried Durian using Fuzzy Logic

In quality control of freeze-dried durian, crispiness is a key quality index of the product. Generally, crispy testing has to be done by a destructive method. A nondestructive testing of the crispiness is required because the samples can be reused for other kinds of testing. This paper proposed a crispiness classification method of freeze-dried durians using fuzzy logic for decision making. The physical changes of a freeze-dried durian include the pores appearing in the images. Three physical features including (1) the diameters of pores, (2) the ratio of the pore area and the remaining area, and (3) the distribution of the pores are considered to contribute to the crispiness. The fuzzy logic is applied for making the decision. The experimental results comparing with food expert opinion showed that the accuracy of the proposed classification method is 83.33 percent.

Authors:

• Sitthichon Kanitthakun
• Pinit Kumhom
• Kosin Chamnongthai

Keywords:

• Durian
• crispiness
• freeze drying
• pore
• fuzzy logic.

References:

[1] W. Khuaying, "Effect of Processing Conditions on Quality of Freezedried
Durian," 2003.
[2] C. Hammami and F. Rene, "Determination of Freeze-dried process
variables for strawberries," J Food Engineering, vol.32, pp.133-154,
1997
[3] C. Hammami, and F. Rene, "Process-quality optimization of the vacuum
freeze-drying of apple slices by the response surface method," J. science
and technology., vol. 34, pp. 145-160, 1999.
[4] D. C. Iwaniw, and G. S. Mittal, "Process optimization of freeze-dried
strawberries," J. Agricultural, vol. 32, pp. 133-154, 1990.
[5] A. A. Khan, and Vincent, "Mechanical damage induced by controlled
freezing in apple and potato," J. Texture Studies., vol. 27, pp. 143-157,
1996.
[6] M. K. Krokida, V. T. Karathanos, and Z. B. Maroulis, "Effect of freezedrying
conditions on shrinkage and porosity of dehydrated agricultural
products," J. Food Enginrring., vol. 35, pp. 369-380, 1998.
[7] E. R. Davies, "Image Processing for the food industry," 2000.
[8] R. C. Gonzalez, and R. E. Woods, "Digital Image Processing," 1992.
[9] A. Von, "Fuzzy Logic & NeuroFuzzy Applications Explained," 2000.
[10] S. Kanitthakun, P. Kumhom, and K. Chamnongthai, "Classifying
Crispiness of Freeze-dried Durian using Fuzzy Logic," Int. Computer
Symposium 2004.
[11] S. A. Goldblith, L. Rey, and W. W. Rothmayr, "Freeze Dring and
Advanced Food Technology," 1975.
[12] Olivera, "Processing Food: quality optimization," 1999.